Telephone receiver



1927. March 8 J. KLEINMAN TELEPHONE RECEIVER Filed March 24 1923 INVENTOR.

IIIIl/IIl/IIIII ATTORN s.

li atentd Mar. 8, 1927.

UNITED STATES PATENT i OFFICE l JACK KLEINMAN, 0E BRONX, NEW YORK, AssIenoR To HENRY HYMAN &co., Ind,

01? NEW YORK, N. Y., A CQRPORATIQN OF NEWYORK.

TELEPHONE Application filed March 24,

H provide a simple means of connecting the" ends of a telephone receiver cord in a receiver. Other objects will appear in the description of the invention which follows:

Referring to the drawings which form a part 01 this specification.

Fig. 1 is a plan view of my diaphragm and armature. V

Fig. 2 is a plan View of my telephone cord connecting piece, as used in a receiver case;

Fig. 3 is a vertical sectional view of the receiver embodying my inventions.

Fig. 4 is a fragmental sectional view. of another means of adjustment.

In the drawings A indicates my. armature with an extending arm A to the center. A indicates a diaphragm of non-magnetic material riveted or welded or otherwise attached as atB at the center to armature A.

C indicates a threaded stud riveted or spot welded or otherwise attached to armature at A. A spring I) is provided to press the diaphragm away from the magnet core Gr'while a' nut F 011 stud C may be provided to draw the diaphragm toward the core. Thus the proper adjustment of distance between the diaphragm and magnet may be efiected. As shown, the diaphragm is pressed tightly be- RECEIVER.

1923. Serial a... 627,519.

'M indicates permanent magnets surrounding coil winding G and core G" andin juxta-v position to core" G at its base. I

N indicates a screw which enters through the hole in the center of casing E through the hole in cord connecting pieceH and into the threaded portion of core piece G. In this manner, core piece G with its winding G, permanent magnets M, and cord connecting piece'H are clamped firmly to case E.

As shown in Figure 4;, the adjustment of the diaphragm may be effected'by a stud C having a head 0 fixed thereto and threaded in the back of the casing or in a boss Kintegral with the casing. Turning of stud C one way will thus force the diaphragm awayv from the magnets, while turning in the other 7 direction Wlll permit it to spring back toward the magnets. I claim: j

1. In a telephone receiver, a casing, an electro-magnet therein, a. non-magnetic diaphragm in the casing and centrally disposed over the magnet, a magnetic ring concentric with the diaphragmand having its periphery held in the casing, said ring having a tongue eXtending to thecenter of the diaphragm with its inner end attached to the J diaphragm and an adjusting member attached to the tongue and extending through the casing at one side of the magnet and arranged to adjust'the tongue and the dia phragm' toward and away from the magnet. 2. inv a telephone receiver, a casing, an electro-magnet secured witlnnsaid casing,

and a wire-securing member clamped between the magnet and casing and having tween the casing E and cap L, so that the acarms arranged to hold wires connected to tion of spring I) and stud Ccauses the d1a-- the magnet.

phragm to bulge one way or another from the middle. i

H indicates my receiver cord connecting piece with a hole in the center and with'two extended arms H curled at the'end as at H to securely grip the ends of the receiver cord J. The ends G of-the winding of the magnet coil G may be soldered to the ends of the cord J as indicatedf L indicates the cap preferably. of hard rubber or vulcanite threaded in the usual manner to fit casing E and clamps armature A and diaphragm A at point L as set forth.

3.111 a telephone receiver, a casing, an electro-magnet therein, securing means extending through the casing and arranged to draw the magnet toward the'wall of the casing, and asheet metal wire securing member having a body portion between the mag,

net and the wall of the casing and having outwardly extending arms arranged to hold .wlres connected to the magnet. 1 V Signed at New York, in the county of New York andState of New York, this 23rd day of March A. 1)., 1923.

' r j JACK KLEINMAN. 

